Until the spell ends, a weapon you touch sucks the light from the surrounding area. Bright light becomes darkness for 30 feet centered on the weapon, and dim light for an additional 30 feet. Attacks made with it deal an extra 2d8 necrotic damage on a hit. If it isn't already a magic weapon, it becomes one for the duration.
As a bonus action, you can dismiss the spell and cause the weapon to release a burst of unholy energy. Each creature of your choice that you can see within 30 feet of the weapon must make a Constitution save. On a failure, it takes 4d8 necrotic damage and it is blinded for 1 minute. On a successful save, it takes half damage and isn't blinded. At the end of each of its turns, a blinded creature can make a Constitution save, ending the blindness on a success.
Comments